Switching device for high tension



Jan. 25, 1955 H. A. HIDDE NIJLAND SWITCHING DEVICE FOR HIGH TENSION Filed March 2, 1954 nited States Patent SWITCHIYG DEVICE FOR HIGH TENSION Hendrik A. Hidde Nijland, Laren, Netherlands, assignor to N. V. Coq, Utrecht, Netherlands The invention relates to a switching device for high tension such as an isolator switch or a circuit-breaker, having fixed switching contacts and at least one switching rod cooperating with said contacts and in which said switching rod is adapted to be longitudinally moved by a driving mechanism and to be retracted from and inserted into said device, respectively, while the fixed switching contacts are electrically alive, said driving mechanism comprising a member which is moved in parallel relation with the switching rod.

It is an object of the invention to provide such a connection between the driving mechanism and the switching rod as to enable the latter to be easily detached from the device and it is characterized in that the above mentioned member of the driving mechanism consists of two spaced apart parallel cross bars, through the space between which the switching rod is passed, said rod being provided at a distance from its head end with an abutment member, which in a predetermined angular position with respect to the axis of said rod abuts against the edges of one side of said bars, but, when turned into another angular position, say at right angles with the first mentioned position, is adapted to be moved through the space between said bars, and further characterized in that the end portion of the switching rod projecting from the edges of the cross bars on the opposite side thereof is provided with a head bearing on said edges and with a knob permitting the switching rod to be brought into the first mentioned angular position and to be locked or, after being unlocked, to be turned into the second angular position and retracted from the device.

Preferably in the switching device according to the invention the knob is loaded by a spring and mounted for axial displacement but locked against rotation with respect to the switching rod, said knob being provided on its surface facing said cross bars with projections, which in the locking position engage due to the action of the spring on the knob, recesses formed in said bars.

For the elucidation of the invention reference is made to the accompanying drawing, in which:

Fig. 1 is partly a sectional view partly an elevational view of a part of the driving mechanism and the switching rods connected therewith of a multiple phase circuitbreaker,

Fig. 2 is a plan view of the connection according to Fig. 1,

Fig. 3 is a sectional view on line IIIIII in Fig. 1, and

Fig. 4 is on a smaller scale and diagrammatically illustrates a sectional view of a circuit-breaker provided with a switching rod connection according to the invention.

In the drawing 1 designates a vertical stationary guiding strip. By means of a driving mechanism, of which Fig. 4 shows only an arm 3 adapted to be swung up and down about a stationary pivot 2, a bridge member consisting of two parallel bars 4 is moved up and down. Said bridge member is guided by the strip 1 and supports a member of switching rods 5 of which the electrically conductive lower portion 5 cooperate with fixed switching contacts 6, 7 (Fig. 4).

The circuit-breaker is so constructed as to allow the switching rods to be removed from and inserted into the casing of the circuit-breaker, while the fixed switching "ice contacts 6, 7 are alive. In order that the switching rods may be removed they are detachably connected to the bridge member 4. It is possible to disconnect said rods by hand. To that end each switching rod 5 is provided with an abutment member 8, which in the angular position of the left hand rod shown in Fig. l abuts against the lower edges of the bridge member 4. However, when it is in the angular position of the right hand switching rod illustrated in Fig. 1 said abutment member is allowed to be passed through the space between the bars 4 of the bridge member, permitting the switching rod to be removed from the circuit-breaker.

Each switching rod is provided at its head end with a head 9, which bears on the cross bars 4 of the bridge member. Above the head 9 a knob 10 is mounted, which is secured to the switching rod by a bolt 9a and is pressed against said head by a spring 11. Said knob is mounted on said bolt for axial movement but it is locked against rotation.

The lower surface of the knob 10 has two diametrically opposite projections 12, which engage recesses 13 of the cross bars of the bridge member, when the switching rod is in the position of the left hand rod illustrated in Fig. 1. Said projections 12 lock the switching rod in the position referred to. If, however, it is desired to disconnect the switching rod, the knob 10 must be moved against the pressure of the spring 11. That means it must be moved upwards, and thereupon the switching rod must be turned through an angle of by means of said knob.

Fig. 4 shows that the driving mechanism is surrounded by a casing 14 of such construction as to permit the knob of each switching rod to protrude from said casing only when the circuit-breaker is in its oft-position. A hood 15 may be provided on the casing 14, so that the switching rods can not be removed before said hood is taken What I claim is:

1. Switching device for high tension comprising, in combination, fixed switching contacts, at least one switching rod cooperating with said contacts and mounted for longitudinal movement, said rod being adapted to be retracted from and inserted into said device, respectively, while the fixed switching contacts are electrically alive, 2. driving mechanism for the reciprocation of the switching rod, two spaced apart parallel cross bars forming part of said driving mechanism and being adapted to be reciprocated in parallel relation with the switching rod, which is passed through the space between said bars and protrudes with its head end from the edges on one side of said bars, a head formed on said head end of the rod and bearing on said bars, an abutment member provided on said rod at a distance from said head and abutting against the edges on the opposite side of said bars, when it is in a predetermined angular position with respect to the axis of the rod, said abutment member being adapted to be moved through the space between said bars, when it is in another predetermined angular position, and a knob mounted on the head end of the switching rod and permitting said rod to be brought into the first mentioned angular position and to be locked in said position and, after its unlocking, to be turned into the second angular position and retracted from the device.

2. Switching device as claimed in claim 1, wherein the knob is mounted for axial displacement but locked against rotation with respect to the switching rod, projections are formed on the surface of said knob facing the cross bars, recesses are formed in said bars and a spring is provided, which tends to keep the knob in a position, in which its projections engage said recesses and the connection between the switching rod and the bars of the driving mechanism is locked.

Read May 19, 1903 Baker et a1. Jan. 27, 1953 

